String Class Implementation in C C++ Programming Language

String Class Implementation in C C++ Programming Language with menu string compare string equal string upper case string lower case


#include<conio.h>
#include<iostream.h>
#include<stdlib.h>
#include<stdio.h>
const int MAX=80;
class MyString
{ private:
      char  str[MAX];
  public:
  void init()
  {
   str[0]=NULL;
  }
  void input()
  {
    cin.ignore(10,'\n');
    cin.get(str,MAX);
  }
  void display()
  {
    cout<<str;
  }
  int strlength();
  void strUpper();
  void strLower();
  int strSearch(MyString);
  void strDelete(MyString);
  int strCompare(MyString);
  int strIcompare(MyString);
  void strConcate(MyString);
};
int MyString::strlength()
{
  int l=0;
  while(str[l]!='\0')
     l++;
  return l;
}
void MyString::strUpper()
{
int i=0;
while(str[i]!=NULL)
  {
    if(str[i]>='a'&&str[i]<='z')
       str[i]=str[i]-32;
    i++;
  }
}
void MyString::strLower()
{
int i=0;
while(str[i]!=NULL)
  {
    if(str[i]>='A'&&str[i]<='Z')
       str[i]=str[i]+32;
    i++;
  }
}
int MyString::strSearch(MyString s)
{
 int i=0,l2;
 l2=s.strlength();
 while(str[i]!='\0')
   if(str[i++]!= s.str[0])
      continue;
 else
 {
  for(int j=1,k=i;j<l2;j++,i++)
   if(str[i] != s.str[j])
    break;
  if(j==l2)
   {
    return k;//k returned for deletion purpose
   }
  else
   i=k;
  }
  return -1;
}
void MyString::strDelete(MyString s)
{
 int i,l1,l2,j,k,len,end,start;
 l1=strlength();
 l2=s.strlength();
 for(i=0;i<l1;i++)
  {
   len=0;
   if(str[i]==s.str[0])
     {
       for(j=i,k=0;k<l2;j++,k++)
{
 if(str[j]==s.str[k])
  {
    len++;
    end=j;
  }
}
      if(len==l2)
       {
start=end-l2+1;
for(i=start,j=end+1;j<=l1;i++,j++)
  str[i]=str[j];
}
     }
   }
}
int MyString::strCompare(MyString s)
{
 int l1,i,temp=0,found;
 char ch[MAX];
 l1=strlength();
 for(i=0;i<l1;i++)
  {
   if(str[i]==s.str[i])
     temp++;
   if(str[i]>s.str[i])
    return -1;
   if(str[i]<s.str[i])
    return 1;
  }
 if(temp==l1)
   return 0;
 else
  return 2;
}
int MyString::strIcompare(MyString s)
{
  int l1,i,temp,found;
  s.strUpper();
  l1=strlength();
  for(i=0;i<l1;i++)
   {
    if(str[i]==s.str[i])
      temp++;
    if(str[i]>s.str[i])
      return -1;
    if(str[i]<s.str[i])
      return 1;
   }
  if(temp==l1)
   return 0;
  else
    return 2;
}
void MyString::strConcate(MyString s)
{
 int l1,l2,i,j,sum;
 l1=strlength();
 l2=s.strlength();
 sum=l1+l2;
 if(sum<80)
  {
    for(i=l1,j=0;j<l2+1;i++,j++)
       str[i]=s.str[j];
  }
else
   cout<<"OVERLOAD STRING";
}
void opermenu();
void stringmenu();
/********************************MAIN FUNCTION*****************************/
void main()
{
 MyString S1,S2,temp;
 int len,r,num,chmain,chstring,choper;
 clrscr();
 S1.init();
 S2.init();
 do
 {
   textcolor(3);
   clrscr();
   gotoxy(22,10);
   cout<<"<*><*><*>MYSTRING MAIN MENU<*><*><*>";
   gotoxy(30,14);
   cout<<"1:STRING NO 1.";
   gotoxy(30,16);
   cout<<"2:STRING NO 2.";
   gotoxy(30,18);
   cout<<"3:OPERATION B/W STRINGS.";
   gotoxy(30,20);
   cout<<"4:EXIT.";
   gotoxy(25,24);
   cout<<"ENTER CHOICE FOR MENU:[   ]";
   gotoxy(49,24);
   cin>>chmain;
   switch(chmain)
   {
     case 1:
  do
  {
   textcolor(6);
   clrscr();
   stringmenu();
   gotoxy(25,32);
   cout<<"ENTER CHOICE FOR MENU:[   ]";
   gotoxy(49,32);
   cin>>chstring;
   switch(chstring)
   {
    case 1:
   clrscr();
   gotoxy(25,2);
   cout<<"**** ENTER STRING ****"<<endl;
   S1.input();
   getch();
   break;
     case 2:
   clrscr();
   gotoxy(25,2);
   cout<<"**** OUTPUT STRING ****"<<endl;
   S1.display();
   getch();
   break;
     case 3:
    clrscr();
    gotoxy(25,15);
    cout<<"****  STRING LENGTH ****";
    gotoxy(28,18);
    cout<<"TOTAL CHARACTER : "<<S1.strlength()-1;
    getch();
    break;
    case 4:
   clrscr();
   gotoxy(25,15);
   cout<<"****  STRING DELETE ****";
   gotoxy(18,20);
   cout<<"ENTER CHARACTER YOU WANT TO DELETE : ";
   temp.input();
   r=S1.strSearch(temp);
   if(r==-1)
    {
      gotoxy(28,22);
      cout<<"* STRING NOT FOUND ! *";
      getch();
    }
   else
    {
      gotoxy(21,22);
      cout<<"DO YOU WANT TO DELETE CHARACTER";
      gotoxy(21,24);
      cout<<"Y=YES";
      gotoxy(48,24);
      cout<<"N=NO";
      char ch=getch();
      if(ch=='y'||ch=='Y')
{
S1.strDelete(temp);
gotoxy(24,27);
cout<<"** CHARACTER IS DELETE **";
getch();
}
    }
    break;
     case 5:
    clrscr();
    gotoxy(25,15);
    cout<<"****  STRING SEARCH ****";
    gotoxy(20,18);
    cout<<"ENTER CHARACTER YOU WANT TO SEARCH : ";
    temp.input();
    r=S1.strSearch(temp);
    if(r==-1)
     {
      gotoxy(28,20);
      cout<<"STRING NOT FOUND";
      getch();
     }
    else
     {
      gotoxy(25,20);
      cout<<"STRING FOUND AT "<<r<<" PLACE";
      getch();
     }
    break;
    case 6:
   clrscr();
   S1.strLower();
   gotoxy(20,20);
   cout<<"<<<* CHRACTER CONVERT INTO  LOWER CASE *>>>";
   getch();
   break;
    case 7:
   clrscr();
   S1.strUpper();
   gotoxy(20,20);
   cout<<"<<<* CHRACTER CONVERT INTO UPPER CASE *>>>";
   getch();
   break;
     case 8:
   chmain=1;
   break;
     default:
     gotoxy(24,34);
     cout<<"INVALID CHOICE PLEASE REENTER";
     chstring=1;
     getch();
    }
 }while(chstring<8);
 break;
     case 2:
  do
  {
   textcolor(6);
   clrscr();
   stringmenu();
   gotoxy(25,32);
   cout<<"ENTER CHOICE FOR MENU:[   ]";
   gotoxy(49,32);
   cin>>chstring;
   switch(chstring)
   {
    case 1:
   clrscr();
   gotoxy(25,2);
   cout<<"**** ENTER STRING ****"<<endl;
   S2.input();
   getch();
   break;
     case 2:
   clrscr();
   gotoxy(25,2);
   cout<<"**** OUTPUT STRING ****"<<endl;
   S2.display();
   getch();
   break;
     case 3:
    clrscr();
    gotoxy(25,15);
    cout<<"****  STRING LENGTH ****";
    gotoxy(28,18);
    cout<<"TOTAL CHARACTER : "<<S2.strlength()-1;
    getch();
    break;
    case 4:
   clrscr();
   gotoxy(25,15);
   cout<<"****  STRING DELETE ****";
   gotoxy(18,20);
   cout<<"ENTER CHARACTER YOU WANT TO DELETE : ";
   temp.input();
   r=S2.strSearch(temp);
   if(r==-1)
    {
      gotoxy(28,22);
      cout<<"* STRING NOT FOUND ! *";
      getch();
    }
   else
    {
      gotoxy(21,22);
      cout<<"DO YOU WANT TO DELETE CHARACTER";
      gotoxy(21,24);
      cout<<"Y=YES";
      gotoxy(48,24);
      cout<<"N=NO";
      char ch=getch();
      if(ch=='y'||ch=='Y')
{
S2.strDelete(temp);
gotoxy(24,27);
cout<<"** CHARACTER IS DELETE **";
getch();
}
    }
    break;
     case 5:
    clrscr();
    gotoxy(25,15);
    cout<<"****  STRING SEARCH ****";
    gotoxy(20,18);
    cout<<"ENTER CHARACTER YOU WANT TO SEARCH : ";
    temp.input();
    r=S2.strSearch(temp);
    if(r==-1)
     {
      gotoxy(28,20);
      cout<<"STRING NOT FOUND";
      getch();
     }
    else
     {
      gotoxy(25,20);
      cout<<"STRING FOUND AT "<<r<<" PLACE";
      getch();
     }
    break;
    case 6:
   clrscr();
   S2.strLower();
   gotoxy(20,20);
   cout<<"<<<* CHRACTER CONVERT INTO  LOWER CASE *>>>";
   getch();
   break;
    case 7:
   clrscr();
   S2.strUpper();
   gotoxy(20,20);
   cout<<"<<<* CHRACTER CONVERT INTO UPPER CASE *>>>";
   getch();
   break;
     case 8:
   chmain=1;
   break;
     default:
     gotoxy(24,34);
     cout<<"INVALID CHOICE PLEASE REENTER";
     chstring=1;
     getch();
    }
 }while(chstring<8);
 break;
   case 3:
do
{
 textcolor(6);
 clrscr();
 opermenu();
 gotoxy(25,24);
 cout<<"ENTER CHOICE FOR MENU:[   ]";
 gotoxy(49,24);
 cin>>choper;
 switch(choper)
 {
  case 1:
clrscr();
r=S1.strCompare(S2);
if(r==0)
 {
   gotoxy(20,20);
   cout<<"STRING # 1 IS EQUAL TO STRING # 2";
 }
if(r==1)
 {
   gotoxy(20,20);
   cout<<"STRING # 1 IS LESS THAN STRING # 2";
 }
if(r==-1)
 {
  gotoxy(20,20);
  cout<<"STRING # 1 IS GREATER THAN STRING # 2";
  }
getch();
break;
  case 2:
clrscr();
r=S1.strIcompare(S2);
if(r==0)
 {
   gotoxy(20,20);
   cout<<"STRING # 1 IS EQUAL TO STRING # 2";
 }
if(r==1)
 {
   gotoxy(20,20);
   cout<<"STRING # 1 IS LESS THAN STRING # 2";
 }
if(r==-1)
 {
   gotoxy(20,20);
   cout<<"STRING # 1 IS GREATER THAN STRING # 2";
 }
getch();
break;
  case 3:
clrscr();
S1.strConcate(S2);
gotoxy(2,2);
cout<<"**** STRING CONCATE ****";
gotoxy(1,3);
S1.display();
getch();
break;
 case 4:
      chmain=1;
      break;
 default:
      gotoxy(25,26);
      cout<<"INVALID CHOICE PLEASE REENTER";
      choper=1;
      getch();

}
       }while(choper>4);
       break;
   case 4:
       exit(0);
       break;
   default:
      gotoxy(24,28);
      cout<<"INVALID CHOICE PLEASE REENTER !";
      chmain=1;
      getch();
  }//switch main end
 }while(chmain<4);
getch();
}
void stringmenu()
{
 clrscr();
 textcolor(6);
 gotoxy(22,10);
 cout<<"<*><*><*>STRING NO 1 MENU<*><*><*>";
 gotoxy(30,14);
 cout<<"1:INPUT STRING.";
 gotoxy(30,16);
 cout<<"2:OUTPUT STRING.";
 gotoxy(30,18);
 cout<<"3:STRING LENGTH.";
 gotoxy(30,20);
 cout<<"4:DELETE STRING.";
 gotoxy(30,22);
 cout<<"5:SEARCH STRING.";
 gotoxy(30,24);
 cout<<"6:CONVERT LOWER CASE.";
 gotoxy(30,26);
 cout<<"7:CONVERT UPPER CASE.";
 gotoxy(30,28);
 cout<<"8:GO TO MAIN MENU.";
}
void opermenu()
{
 textcolor(6);
 gotoxy(24,10);
 cout<<"<*><*><*>OPERATION MENU<*><*><*>";
 gotoxy(30,14);
 cout<<"1:STRING COMPARE.";
 gotoxy(30,16);
 cout<<"2:STRING ICOMPARE.";
 gotoxy(30,18);
 cout<<"3:STRING CONCATE.";
 gotoxy(30,20);
 cout<<"4:GO TO MAIN MENU.";
}